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Ovicula biradiata, a new genus of Compositae from Big Bend National Park in Trans-Pecos Texas

by: Manley, Debra L.; Lichter Marck, Isaac H.; Peralta, Keily; Castro Castro, Arturo; Wogan, Kelsey A.; Whiting, Carolyn V.; Powell, A. Michael

Publication date: 2025-2-18
Usage: https://creativecommons.org/share-your-work/public-domain/cc0/
Topics: Asteraceae, biodiversity, calciphile, Chihuahuan Desert, Helenieae, taxonomy, Tetraneurinae, Asteraceae, biodiversidad, calcifilo, Desierto Chihuahuense, Helenieae, taxonomía, Tetraneurinae
Publisher: Pensoft Publishers
Collection: biodiversity
Contributor: Pensoft Publishers
Language: English
Rights: https://biodiversitylibrary.org/permissions
Rights-holder: Copyright held by individual article author(s).
Volume: 252
Item Size: 28.9M

Abstract: Here, we describe and illustrate a new monospecific genus of Compositae, Ovicula biradiatagen. et sp. nov., from the Chihuahuan Desert in Big Bend National Park, Texas. Ovicula biradiata is a very locally abundant, yet range-limited, spring annual herb found in coarse calcareous alluvium. Based on its pistillate ray florets, pappus of hyaline, aristate scales, tomentose foliage and slightly saucer-shaped to flat, epaleate receptacle, we determine that the new species has affinities with the Helenioid subtribe Tetraneurinae in the Heliantheae alliance. Molecular phylogenetic analysis of nrDNA (ITS) sequence data supports the phylogenetic position of Ovicula biradiata within the subtribe Tetranuerinae, where it is resolved as the sister lineage to the genus Psilostrophe. We also present detailed habitat information, high-resolution images captured using a dissecting microscope and scanning electron micrographs of vegetative and reproductive characters of Ovicula biradiata and related taxa, as well as provide an updated key to the genera of Tetraneurinae. Finally, we discuss the significance of this remarkable discovery for community science, biodiversity exploration and plant conservation in the Chihuahuan Desert.
Addeddate: 2025-05-02 23:25:05
Bhl_virtual_titleid: 210913
Bhl_virtual_volume: v.252 (2025)
Call number: 10_3897_phytokeys_252_137624
Call-number: 10_3897_phytokeys_252_137624
Foldoutcount: 0
Genre: article
Identifier: oviculabiradiat252manl
Identifier-ark: ark:/13960/s2qjf4w6kbk
Identifier-bib: 10_3897_phytokeys_252_137624
Identifier-doi: 10.3897/phytokeys.252.137624
Ocr: tesseract 5.3.0-6-g76ae
Ocr_detected_lang: en
Ocr_detected_lang_conf: 1.0000
Ocr_detected_script: Latin
Ocr_detected_script_conf: 1.0000
Ocr_module_version: 0.0.21
Ocr_parameters: -l eng
Page_number_confidence: 97
Page_number_module_version: 1.0.5
Page_range: 141-162
Pages: 22
Pdf_degraded: invalid-jp2-headers
Pdf_module_version: 0.0.25
Possible copyright status: In copyright. Digitized with the permission of the rights holder.
Ppi: 300
Source: PhytoKeys 252
Year: 2025